Selection of Cases and Attributes Plans
While the overall philosophy of this book is to control microbial hazards through raw material selection, GHP and HACCP, and not to rely on microbiological testing, there are occasions when testing might be considered. If it is concluded that testing is appropriate, this chapter provides guidance on the choice of sampling plan and discusses their limitations. The recommended sampling plans are based on statistical considerations in Chaps. 6 and 7, severity of the hazard and change in risk (decrease, no change, or increase) before a food is consumed. The International Commission on Microbiological Specifications for Foods (ICMSF) recommended 15 cases that reflect different levels of risk (ICMSF 1974, 1986). The greater the risk, the higher the case number, and the more stringent the sampling plan (see Sect. 8.5 and Table 8.1).
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